System-board switches and jumpers

This section contains information regarding the system board switches and jumpers.

Figure 1. Location and description of switches and jumpers

The following table describes the functions of switches and jumpers on the system board.

Table 1. System board switches and jumpers definition.

The jumper description table with one level of row and column headers.

Jumper number	Jumper name	Jumper setting
J12	Low security jumper	Pins 1 and 2: Normal (default). Pins 2 and 3: Activate low security.
OVR 1	IMM SPI enable jumper	Pins 1 and 2: Disabled. Pins 2 and 3: Enable IMM SPI half ROM default)
J16	UEFI boot backup jumper	Pins 1 and 2: Boot from primary BIOS page (default). Pins 2 and 3: Boot from backup BIOS page.
CLR RTC 1	Clear CMOS jumper	Pins 1 and 2: Keep CMOS data (default). Pins 2 and 3: Clear CMOS data.
Note If no jumper is present, the server responds as default. Changing the position of the boot block jumper from pins 1 and 2 to pins 2 and 3 for 5 seconds before the server is turned on alters which flash ROM page is loaded. Do not change the jumper pin position after the server is turned on. This can cause an unpredictable problem.

Important

1. Before you change any switch settings or move any jumpers, turn off the server; then, disconnect all power cords and external cables. Review the information in Safety, Installation guidelines, Handling static-sensitive devices, and Turning off the server.
2. Any system-board switch or jumper blocks that are not shown in the illustrations in this document are reserved.
3. If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to access the switches.